+1 for raising that crucial distinction between discovering and revealing, which I too think applies to most idiomatic forms. Unearth, ferret/worm out, etc. as opposed to blab, squeal, sing, rat, snitch, split, etc., etc.. As you can probably guess, I also think there are more (mostly negative) ones for the latter!
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FumbleFingersOct 16 '11 at 15:21